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To improve the service life and operational safety, shielded pumps are usually equipped with the following protection. (1) Bearing Wear Monitor Bearing wear monitor is usually divided into mechanical, mechanical and electrical, electrical, electronic and other types according to its detection principle. When the shielded pump is running, it can monitor the running condition of the bearing at any time through the bearing wear monitor. When the bearing wear is large, it is necessary to stop or repair the bearing or replace the bearing. If the bearing is damaged during operation, stop immediately. Pipeline mechanical monitoring bearing wear the most direct bearing, high reliability, but not adjustable, there is no warning function. Other forms of bearing monitoring, can achieve on-site display, and can output 4 ~ 20mA signal and alarm switch signal. Today's latest valid order information free to send! Morning latest buyers information free to send! Punch grab Rob here! Figure 2-15 shows the common type shield pump bearing wear monitor is electronic. (2) The current protection shield pump in the case of empty running empty, it will cause damage to the pump. When the flow rate dropped significantly, the current will be greatly reduced, this time the current protector can send a control signal through the user's protective device to stop the pump to prevent accidents. Similarly, the magnetic pump in the load is too large, the current increases more, the current protection will operate, automatically cut off the current, the motor stops running to prevent accidents. (3) Motor over-temperature protection Pre-embedded temperature sensor in the stator three-phase winding to achieve over-temperature alarm, to avoid the motor winding temperature exceeds its insulation level requirements, at the same time is to meet the explosion-proof performance of a temperature group supplement. The sensor is mainly divided into three types: thermistor (PTC), thermal switches and thermal resistance (such as PTl00), the first two kinds of low prices, the use of more extensive. Temperature switches and thermistors are bit-controlled, alarm temperature is not adjustable, and the thermal resistance sensor through the corresponding display instrument, you can real-time monitoring of the motor winding temperature changes, which are usually used in important pump position and special winding form . In addition to the above three kinds of protection devices, the shield pump can also configure the heat exchange capacity monitor, liquid level monitor or within the motor with internal pressure protector, etc., in order to meet the needs of different uses shield pump safety protection.
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